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Batman-adv 2026.2 released

Added by Sven Eckelmann 10 days ago

June 30th, 2026: The B.A.T.M.A.N. team is excited to announce the release of the June 2026 update for batman-adv! A new wifi flags hashtables was introduced to reduce the per-packet overhead in the translation table wifi flags handling. It will also be used in a future release to get rid of the batman-adv induced overhead of each Ethernet-like interface on the system. The TVLV serialization code was optimized to avoid unnecessary allocations for the output buffer. Several bug fixes and code cleanups are included in this version.

Since the kernel module is always dependent on the specific Linux kernel it’s compiled against, providing precompiled binaries on our website is not feasible. As always, you can find the signed tarballs in the download section:

https://downloads.open-mesh.org/batman/releases/batman-adv-2026.2/

Thanks

Many thanks to everyone who contributed patches:

And a special thanks to those who supported us with valuable advice and thorough testing:

batman-adv

  • support latest kernels (5.10 - 7.2)
  • coding style cleanups and refactoring
  • switch wifi flags lookup to specialized rhashtable
  • skip unnecessary TVLV buffer allocation of each OGM transmission
  • bugs squashed:
    • batman_iv: stop caching unowned originator pointers
    • batman_iv: fix integer overflow on buff_pos
    • batman_iv: avoid bonding logic for outgoing OGM
    • batman_iv: recover OGM scheduling after forward packet error
    • batman_v: stop OGMv2 on disabled interface
    • batman_v: prevent ELP transmission interval underflow
    • batman_v: prevent OGM aggregation on disabled hardif
    • bla: prevent use-after-free when deleting claims
    • bla: only purge non-released claims
    • bla: put backbone reference on failed claim hash insert
    • bla: fix report_work leak on backbone_gw purge
    • bla: avoid double decrement of bla.num_requests
    • bla: avoid NULL-ptr deref for claim via dropped interface
    • bla: annotate lasttime access with READ/WRITE_ONCE
    • bla: reacquire gw address after skb realloc
    • dat: acquire ARP hw source only after skb realloc
    • dat: ensure accessible eth_hdr proto field
    • dat: handle forward allocation error
    • dat: prevent false sharing between VLANs
    • frag: fix reassembly length accounting
    • frag: disallow unicast fragment in fragment
    • frag: ensure fragment is writable before modifying TTL
    • frag: avoid underflow of TTL
    • gw: acquire ethernet header only after skb realloc
    • gw: clear current gateway during teardown
    • gw: don't deselect gateway with active hardif
    • mcast: fix use-after-free in orig_node RCU release
    • routing: access unicast_ttvn skb->data only after skb realloc
    • routing: ensure bcast is writable before modifying TTL
    • routing: fix (m|b)cast csum after decrementing TTL
    • routing: retrieve ethhdr after potential skb realloc on RX
    • tp_meter: reject new sessions during teardown
    • tp_meter: stop sessions during mesh teardown
    • tp_meter: fix counter underflow during shutdown
    • tp_meter: fix tp_num leak on kmalloc failure
    • tp_meter: fix tp_vars reference leak in receiver shutdown
    • tp_meter: avoid use of uninit sender vars
    • tp_meter: directly shut down timer on cleanup
    • tp_meter: fix race condition in send error reporting
    • tp_meter: avoid role confusion in tp_list
    • tp_meter: keep unacked list in ascending ordered
    • tp_meter: initialize dup_acks explicitly
    • tp_meter: initialize dec_cwnd explicitly
    • tp_meter: avoid window underflow
    • tp_meter: avoid divide-by-zero for dec_cwnd
    • tp_meter: fix fast recovery precondition
    • tp_meter: handle seqno wrap-around for fast recovery detection
    • tp_meter: add only finished tp_vars to lists
    • tp_meter: use locking for all congestion control variables
    • tp_meter: initialize last_recv_time during init
    • tp_meter: restrict number of unacked list entries
    • tp_meter: annotate last_recv_time access with READ/WRITE_ONCE
    • tp_meter: prevent parallel modifications of last_recv
    • tp_meter: handle overlapping packets
    • tt: reject oversized local TVLV buffers
    • tt: fix negative tt_buff_len
    • tt: fix negative last_changeset_len
    • tt: fix TOCTOU race for reported vlans
    • tt: avoid empty VLAN responses
    • tt: prevent TVLV entry number overflow
    • tt: don't merge change entries with different VIDs
    • tt: track roam count per VID
    • tvlv: abort OGM send on tvlv append failure
    • tvlv: reject oversized TVLV packets
    • tvlv: avoid race of cifsnotfound handler state
    • tvlv: enforce 2-byte alignment

batctl

  • coding style cleanups and refactoring
  • bugs squashed:
    • don't stop on missing batman-adv version file

alfred

  • coding style cleanups and refactoring

Happy routing,

The B.A.T.M.A.N. team


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